JP4865263B2 - Fire alarm - Google Patents

Description

The present invention relates to a fire alarm that is installed in a general house or the like and monitors and alarms a fire by driving a battery.

  Conventionally, in battery-operated alarms that are installed in ordinary homes and monitor fires, the alarm unit is equipped with a sensor unit and an alarm unit. Compared to the fire alarm system that fires a fire alarm, detects a fire with a fire sensor connected to the sensor line installed in the building or apartment house, and sends a fire signal to the receiver to alarm. Since the alarm can be monitored and alarmed with a single alarm device, it is easy to install and inexpensive, and is expected to be widely used as a fire monitoring device for ordinary houses.

  In recent years, as a result of efforts to reduce power consumption of alarm devices, a long battery life of, for example, five years or more is guaranteed, and no battery replacement is required during that period. When the battery is used for a long time and nears the end of its battery life and a decrease in battery voltage is detected, an alarm for notifying that the battery has run out is issued.

Conventionally, as such a battery voltage drop alarm, a fire alarm device that outputs a battery dead alarm from a speaker after a predetermined time has elapsed since the battery voltage drop was detected in order to reduce the battery dead alarm from night to early morning. (Patent Document 1) or when the battery voltage has dropped below a predetermined voltage, the power lamp is turned on or blinked to notify the battery drop, and if a switch operation is performed in this state, battery replacement is urged. A battery-type alarm device (Patent Document 2) that outputs a voice message including contents from a speaker is known.
JP 2005-44317 A JP 2004-54356 A

  However, in such a conventional battery alarm, when a battery has run out, replace the battery by notifying the user at least within the day when the battery has run out as soon as possible. Therefore, if the battery is not replaced, the battery warning will continue to be output and the battery will run out, and the user may use the battery without noticing it. is there.

In particular, when a battery voltage drop is detected and a low battery warning is issued when the user has been absent for a long period of time, such as from a week to half a month on a trip or business trip, the battery runs out during the absence. In other words, there is a problem that the user never notices that the battery has run out, and continues to use it as expected even though the battery has run out.

The present invention provides a fire alarm capable of reliably informing the user of battery exhaustion in consideration of both when the user is at home and when the user is absent for a long period of time when a decrease in battery voltage is detected. The purpose is to provide a vessel.

In order to achieve this object, the present invention is configured as follows. Fire alarm of the present invention includes a battery for supplying operating power, is operated by the inspection operation unit, and a test switch for confirming a predetermined operation, an operation of inspecting and switch when detecting the voltage drop of the batteries when detecting, obtain Preparations and voltage drop warning unit for outputting a predetermined voice message.

Here, if the operation of the inspection switch is not detected until a predetermined time has elapsed from the detection of the voltage drop, the voltage drop alarm unit intermittently outputs an alarm sound at a predetermined cycle and checks during the intermittent output of the alarm sound. When switch operation is detected, a predetermined voice message is output and intermittent output of alarm sound is stopped for a predetermined time .

In addition, the voltage drop alarm unit displays a predetermined failure when detecting a voltage drop of the battery, and outputs a predetermined voice message when an operation of the inspection switch is detected during the failure display .

Here, the voltage drop alarm unit blinks the indicator lamp at a predetermined cycle and displays a fault .

Voltage drop alarm unit, when the operation of the inspection switch until after a predetermined period from the detection of the voltage drop is not detected, starts intermittent output alarm sound, then, by shortening the predetermined cycle stepwise alarm Perform intermittent sound output .

Here, every time the alarm sound is output a predetermined number of times after the start of the output of the alarm sound , the voltage drop alarm unit shortens the predetermined cycle in which the alarm sound is intermittently output stepwise .

In addition, the alarm device of the present invention includes a monitoring control unit that determines a fire from the detection signal of the sensor unit and outputs an alarm message, and the voltage drop alarm unit detects a battery voltage drop during an alarm operation by the monitoring control unit. If detected, the alarm operation is stopped after a predetermined time, and a voltage drop alarm operation is performed .

  According to the present invention, when a decrease in battery voltage is detected while the user is at home, the user is informed of the failure by blinking the indicator lamp, and operating the inspection switch in this state causes the battery to run out. By outputting a voice message that prompts the dealer to contact you, you can respond appropriately to running out of batteries.

  Further, if the check switch is operated and the voice message is heard and then left as it is, for example, the voice message is output again every time about 12 hours elapses, thereby preventing the user from forgetting to respond.

  On the other hand, when a decrease in battery voltage is detected while the user is absent for a long period of time, the blinking of the indicator lamp is continued at a cycle of about 10 seconds, for example, for one week. For example, a simple alarm sound is output every 50 seconds, and a low battery warning is output continuously for as long as possible with the minimum amount of power consumption. I'm trying to tell if the battery is dead.

  In order to avoid detection of battery voltage drop due to battery voltage drop due to temporary voltage drop or temperature fluctuation, for example, an alarm is issued only when battery drop continues for 16 hours or more. Can be detected accurately and alarmed.

  In addition, after switching to output intermittent alarm sounds, for example, at intervals of 50 seconds, for example, one week after the blinking of the indicator lamp, the user can run out of batteries by gradually shortening the output interval of the alarm sounds. It is easy to notice.

  If a decrease in battery voltage is detected during an alarm operation due to a malfunction, etc., if the alarm operation is continued as it is, the battery will run out and an out-of-battery alarm will not be issued. Alarm output is performed.

Furthermore, a wireless tag is provided on the alarm device, and the battery voltage drop detection information is stored in the wireless tag. After the battery is exhausted, the content of the wireless tag is read from the outside using a tag reader, and the battery is exhausted. It is possible to take appropriate measures such as recognizing this and replacing the alarm.

FIG. 1 is an explanatory view of an embodiment of a fire alarm according to the present invention. In the following explanation, it is simply called an alarm device. In FIG. 1, an alarm device 10 of the present invention comprises a main body 11a and a cover 11b, protrudes from the front upper portion of the cover 11b to form a smoke inlet 14, and has a scattered light type smoke detection mechanism therein. Built-in part.

  A two-color LED indicator lamp 15 and a speaker sound opening 16 are provided below the smoke inlet 14. The two-color LED indicator lamp 15 includes a red LED and a green LED, and performs a necessary lighting display in the event of a fire, inspection, failure including a decrease in battery voltage, or the like. A speaker that outputs an alarm message is built in the speaker sound port 16.

  Further, an inspection operation unit 18 by a ring suspended from a string is provided at the lower part of the cover 11b. If the inspection operation unit 18 is pulled for a certain time during monitoring, an alarm message for confirming the operation is output, and a fire is caused. When an alarm is output at the time of detection, the alarm output can be stopped by continuously pulling the inspection operation unit 18. Further, if the inspection operation unit 18 is pulled when a failure is displayed by blinking the two-color LED indicator lamp 15, a voice message indicating the occurrence of a failure such as a battery exhaustion is output.

  The alarm device 10 can be attached to a wall surface of a room in a general house by a mounting bracket 12. The mounting bracket 12 is integrally formed with a hook 26 on the front, and is fixed to the wall surface with two pins. In this state, the hook hole 22 of the mounting portion 20 provided integrally with the upper portion of the main body 11a is hung on the hook 26. Can be attached.

  FIG. 2 is an exploded view of the alarm device 10 of FIG. In FIG. 2, the alarm device 10 of the present invention can be disassembled into a main body 11a and a cover 11b. A printed circuit board 82 including a smoke detector 84 is assembled on the cover 11b side, and the speaker 50 is further assembled.

  A battery 28 is assembled and fixed behind the printed circuit board 82. When the battery 28 is assembled and fixed, its lead terminal is connected to the printed circuit board 82 by soldering. For example, three sponges 86 are arranged inside the main body 11a opposite to the battery 28, and when the cover 11b and the main body 11a are fixed, the battery 28 is pressed so as not to move as a cushioning material.

  A switch fixing contact 52b that constitutes an inspection switch is mounted on the printed circuit board 82, and a switch movable contact piece 52a is attached adjacent thereto by screwing and fixing the screw 88 to the cover 11b of the printed circuit board 82. The switch movable contact piece 52a is connected with a string 18a to which the inspection operation unit 18 is attached. By pulling the string 18a by the inspection operation unit 18, the switch movable contact piece 52a is brought into contact with the switch fixed contact 52b side to check the switch. Can be turned on.

  The main body 11a is assembled to the cover 11b with the printed circuit board 82, the speaker 50, the battery 28, and the sponge 86 interposed therebetween, and is fixed by two screws 88 from the main body 11a side.

  In the alarm device 10 of the present invention having such an assembly / disassembly structure, the battery is assembled and fixed in the assembled state of FIG. 1, and the built-in battery 28 is used unless the alarm device 10 is disassembled. Cannot be replaced, and replacement of the battery 28 on the user side is not planned. In addition, since the power supply line of the battery 28 is connected to the printed circuit board 82 by solder or the like, even if the alarm device 10 is disassembled, the replacement of the battery 28 is a very special operation.

  FIG. 3 is an exploded view of the smoke detector 84 provided on the printed circuit board 82 of FIG. In FIG. 3, the smoke detector main body 90 is assembled to the printed circuit board 82. A light emitting element 42 and a light receiving element 44 are incorporated in the smoke detector main body 90 with a predetermined scattering angle, and a shield cap 45 for preventing noise is attached to the light receiving element 44 side.

  The space below the smoke detector main body 90 is a smoke detector space, and a smoke detector cover 94 equipped with an insect screen 92 is disposed in the smoke detector space, and a smoke inflow passage opened to the periphery through the insect screen 92 The labyrinth structure that forms is realized.

  FIG. 4 is a block diagram showing an embodiment of the circuit configuration of the alarm device according to the present invention. In FIG. 4, a battery 28 using a lithium battery or the like is built in the alarm device. As the battery 28, for example, a voltage range of 4.2 volts to 7.0 volts is guaranteed. A power supply line from the battery 28 is supplied to a power supply circuit 30 for CPU, a power supply circuit 32 for audio, and a power supply circuit 34 for sensors, and outputs a predetermined power supply voltage suitable for each load.

  The alarm device is provided with a CPU 36 that functions as a control circuit. A sensor unit 35 is provided for the CPU 36. The sensor unit 35 is provided with a light emitting circuit 38 and a light receiving circuit 40. The light emitting circuit 38 intermittently drives the light emitting element 42 using the LED to emit light in synchronization with the control pulse from the CPU 36, and is scattered by the scattered light type smoke detecting mechanism, that is, the smoke flowing into the smoke detecting section shown in FIG. The light is received by the light receiving element 44 using a photodiode, amplified by the light receiving circuit 40, and then output to the CPU 36.

  A display circuit 46 is provided for the CPU 36, and the display circuit 46 drives the display of the two-color LED indicator lamp 15 shown in FIG. Further, a voice circuit 48 is provided for the CPU 36 so that a predetermined voice message accompanying a failure including fire, inspection, battery exhaustion is outputted from the speaker 50.

  Further, a voltage detection circuit 54 is provided for the CPU 36 so that when the battery voltage from the battery 28 drops below a predetermined voltage, a battery voltage drop detection signal is output to the CPU 36 so that a battery voltage drop alarm is issued. Yes.

  Further, a transfer circuit 55 and a transfer reception circuit 58 are provided for the CPU 36. The transfer circuit 55 outputs a transfer signal to the transfer connector 56 when the CPU 36 detects a fire based on the detection signal from the sensor unit 35. The alarm connector of the present invention installed in another room is interconnected to the message connector 56 by a message signal line.

  Therefore, the transfer signal from the transfer circuit 55 is sent to another alarm device via the transfer connector 56, received by the transfer receiving circuit 58, and causes the CPU 36 to perform a linked alarm. Further, a non-volatile memory 60 using an EEPROM or the like is connected to the CPU 36.

The CPU 36 includes a function of the monitoring control unit 62 and a function of the voltage drop alarm unit 64 realized by executing the program. The monitoring control unit 62 determines a fire from the light reception detection signal from the light receiving circuit 40 provided in the sensor unit 35, and performs a fire alarm by the display driving of the display circuit 46 and the output of an alarm message by the audio circuit 48. Further, when an operation signal is received from the inspection switch 52 in a normal monitoring state, a control function for confirming an alarm operation by the display circuit 46 and the audio circuit 48 is achieved.

  Here, the operations of the display circuit 46 and the sound circuit 48 in the alarm device of the present invention are as follows.

  First, when a fire is detected, the display circuit 46 repeats the process of flushing after the red LED is continuously turned on, and the audio circuit 48 repeats “Woo, it is a fire, it is a fire”. On the other hand, at the time of inspection when the inspection switch 52 is operated, the display circuit 46 lights up the red LED, and the sound circuit 48 sounds once after a “pi” sound, “Woooo, it is a fire, it is a fire” End with a “beep” sound.

  The voltage drop alarm unit 64 provided in the CPU 36 is provided in the display circuit 46 with a predetermined cycle, for example, a cycle of T1 = 10 seconds, when the battery dead is detected based on the battery voltage detection signal from the voltage detection circuit 54. When the green LED of the color LED indicator 15 blinks, and the operation of the inspection switch 52 is detected in this state, the voice circuit 48 operates, and a voice message indicating that the battery is dead is output from the speaker 50 for notification. This voice message outputs, for example, a message “Battery has run out. Please contact your dealer”.

  Further, the voltage drop alarm unit 64 detects the operation of the inspection switch 52, outputs a voice message once to notify that the battery has run out, and then repeats the voice every time a predetermined time T2, for example, T2 = 12 hours elapses. A message is output and notified.

Further, the voltage drop alarm unit 64 detects the battery voltage drop and blinks the green LED of the two-color LED indicator lamp 15 at a period of T = 10 seconds, and the inspection switch even after a certain period of time, for example, one week has passed. When the operation of 52 is not detected, in addition to the blinking of the green LED, the sound circuit 48 causes the speaker 50 to output an intermittent alarm sound such as “beep” at a predetermined cycle T3, for example, T3 = 50 seconds.

If the operation of the inspection switch 52 is detected while the alarm sound “beep” is output at a cycle of 50 seconds, the voice circuit 48 outputs a voice message indicating that the battery has run out from the speaker 50. The intermittent output of the alarm sound such as “beep” with a period of T3 = 50 seconds is continued until the battery runs out.

  Here, the detection of the voltage drop by the voltage drop alarm unit 64 determines that the battery voltage has dropped when the voltage detection signal from the voltage detection circuit 54 has remained below the threshold voltage for a predetermined time, and the battery voltage drop has been detected. Thereafter, the detection state is held.

  In the present invention, when the state where the voltage detection signal of the voltage detection circuit 54 is equal to or lower than the threshold voltage continues for 16 hours or more, the battery voltage drop is determined and held. The duration for determining the decrease in the battery voltage can be appropriately set in the range of 16 hours to a maximum of 32 hours.

  Even if the capacity of the battery 28 is reduced due to a temporary voltage drop or a temperature fluctuation by setting a sufficiently long delay time for determining a sufficiently long voltage drop, such a temporary fluctuation is caused. On the other hand, the battery voltage drop is not detected, and an unnecessary battery voltage drop warning is prevented.

  Further, in this embodiment, a wireless tag 70 is provided for the CPU 36. The wireless tag 70 is usually known as a wireless IC tag, and includes a wireless transmission / reception circuit, a processor, and a memory. When necessary information is written in the memory, a dedicated reader is used even if the power supply is cut off. By doing so, the contents of the memory can be read out by operating upon receiving power supply by the electromagnetic field from the reader.

  In the present invention with respect to such a wireless tag 70, when the battery voltage drop is detected by the voltage drop alarm unit 64 of the CPU 36, information indicating the battery voltage drop is stored in the log 66 of the nonvolatile memory 60 as an event log. Simultaneously with the storing, the history information of the voltage drop detection of the battery 28 is also stored in the memory of the wireless tag 70, and stored in the memory of the wireless tag 70 by using a dedicated reader from the outside even after the battery 28 is exhausted. The battery voltage drop detection history information can be read out.

  FIG. 5 is a flowchart of alarm processing by the voltage drop alarm unit 64 provided in the CPU 36 of FIG. In FIG. 5, in the voltage drop alarm process, the voltage detection signal of the battery 28 detected by the voltage detection circuit 54 in step S1 is read, and in step S2, it is checked whether or not it is equal to or lower than a predetermined threshold voltage Vth.

  When the voltage is equal to or lower than the threshold voltage Vth, the process proceeds to step S3, and it is checked whether or not it continues for a predetermined time, for example, 16 hours. When the state of the battery voltage V that is equal to or lower than the threshold voltage Vth continues for 16 hours or more, the process proceeds to step S4, and a decrease in the battery voltage is detected and held.

Next, in step S5, the green LED of the two-color LED indicator lamp 15 of FIG. 1 provided in the display circuit 46 blinks at a cycle of T1 = 10 seconds. In this state, the presence or absence of the operation of the inspection switch 52 is determined in step S6. When the operation of the inspection switch 52 is determined, the process proceeds to step S7, the voice circuit 48 is operated, and a voice message indicating that the battery has run out is output from the speaker 50. For example, “Battery has run out. Please contact your dealer” is output.

  After that, it is checked in step S8 whether the set time T2 = 12 hours has elapsed since the voice message output. If 12 hours have passed, the process returns to step S7 to output the voice message again.

  On the other hand, if the operation of the inspection switch 52 is not detected in step S6, the process proceeds to step S9, and it is monitored whether one week has passed since the battery voltage drop was detected. When it is determined in step S9 that one week has elapsed, the process proceeds to step S10, and the operation of the audio circuit 48 outputs “beep” as an alarm sound from the speaker 50, which is output every time T3 = 50 seconds in step S11. repeat.

  Subsequently, whether or not the inspection switch is operated is checked in step S12. If the operation of the inspection switch 52 is determined during the output of the alarm sound “beep” at T3 = 50 second intervals, a voice message is sent in step S7. In step S8, the voice message is repeatedly output every time T2 = 12 hours.

  When the battery voltage drop detection is held in step S4, the voltage drop detection history information is stored in the log 66 of the nonvolatile memory 60 in FIG. Remember.

  In the process of FIG. 5, when the operation of the inspection switch is determined in step S12 during the intermittent output of the alarm sound by the processes of steps S9 to S12, a voice message is output in step S7, and in step S8. The voice message is output again after the time T2 elapses, but after outputting the voice message in step S8, intermittent output of the alarm sound is stopped for a predetermined time, and then the intermittent output of the alarm sound is performed. May be.

  FIG. 6 is a flowchart showing another embodiment of the voltage drop alarm process according to the present invention. In this embodiment, the operation of the inspection switch 52 is not detected, and a “beep” which is an alarm sound after one week is detected. After switching to the intermittent output, the interval of intermittent output of the alarm sound is gradually shortened.

  In FIG. 6, the processing of steps S1 to S8 is the same as the flowchart of FIG. If the operation of the inspection switch is not discriminated in step S6, the elapse of one week is discriminated in step S9, and every time T3 = 50 seconds elapses in step S10, an alarm beep is intermittently outputted in step S11. Output.

  In addition, in this embodiment, it is checked whether or not the number of alarms reaches a predetermined m times in step S12 for the output of the alarm sound “beep” with a period of T3 = 50 seconds. When the number of times reaches, the process proceeds to step S13, and the cycle is shortened from T3 = 50 seconds so far to T4 = 25 seconds. Every time T4 = 25 seconds elapses, a “beep” is output as an alarm sound in step S14. Yes.

  For the intermittent output of the alarm sound at intervals of T4 = 25 seconds, when the number of alarms reaches n times at step S15, the process proceeds to step S16, and at every elapse of T5 = 10 seconds, the alarm sound “pip” at step S17. The intermittent output is repeated.

  In this way, the LED blinking notification with T1 = 10 second period due to the battery voltage drop detection, the inspection switch 52 is not operated, and the interval of the intermittent output of the alarm sound after one week has been gradually shortened. Thus, for example, when a user who has been absent for a long time returns home, the battery voltage can be reliably reduced.

  In addition, when the operation of the inspection switch 52 is performed with respect to the intermittent alarm sound output during the processing of step S9 to step S17, the voice message is output in step S7. Omitted.

  FIG. 7 is a flowchart showing another embodiment of the voltage drop alarm process according to the present invention. This embodiment is provided with a process for dealing with a case where a battery voltage drop occurs during an alarm operation due to a fire detection. And

  In FIG. 7, the battery voltage decrease detection holding in steps S1 to S4 is the same as in the embodiment of FIG. 5, but after the battery voltage decrease detection is held in step S4, an alarm is given by the monitoring control unit 62 of the CPU 36 in step S5. Check if it is working. If the alarm is being activated, the elapse of a predetermined T0 time is monitored in step S6.

  This T0 time is a time sufficient to notify the user of the alarm, and is set as a time for suppressing the battery consumption to such an extent that the battery low alarm can be sufficiently issued even if the alarm operation is performed in the state where the battery voltage decrease is detected. . When a predetermined time T0 has elapsed in step S6, the alarm operation is forcibly stopped in step S7. In step S8, a voltage drop alarm process in steps S8 to S15 is performed as in steps S5 to S12 in FIG.

  For example, when the alarm is activated due to a malfunction, for example, when the alarm operation is continued due to a malfunction, the battery is exhausted and the battery is exhausted. Although a battery voltage drop alarm cannot be performed, this can be prevented beforehand.

In the embodiment described above, the blinking period T1 of the LED when a decrease in the battery voltage is detected, the elapsed time T2 of the re-output after outputting the voice message, and the intermittent output of the alarm sound from the blinking of the LED For example, the elapsed time of one week, and the period T3 for intermittently outputting the alarm sound after one week has passed, are not limited to the numerical values in the above-described embodiment, and can be set as appropriate as required. In addition, the present invention includes appropriate modifications that do not impair the objects and advantages thereof.

Explanatory drawing of embodiment of the alarm device by this invention Assembly exploded view of FIG. Assembly exploded view of the smoke detector in FIG. The block diagram which showed embodiment of the circuit structure of the alarm device by this invention Flowchart of battery voltage drop alarm processing according to the present invention Flowchart of another battery voltage drop alarm process according to the present invention that gradually shortens the intermittent output interval of the alarm sound. Flowchart of another battery voltage drop alarm process according to the present invention for detecting and processing a battery voltage drop during an alarm operation

Explanation of symbols

10, 10a to 10c: Alarm 11a: Main body 11b: Cover 12: Mounting bracket 14: Smoke inlet 15: Two-color LED indicator lamp 16: Speaker acoustic port 18: Inspection operation unit 18a: String 20: Mounting unit 22: Hook Hole 26: Hook 28: Battery 30, 32, 34: Power supply circuit 35: Sensor unit 36: CPU
38: Light emitting circuit 40: Light receiving circuit 42: Light emitting element 44: Light receiving element 45: Shield cap 46: Display circuit 48: Audio circuit 50: Speaker 52: Inspection switch 52a: Switch movable contact piece 52b: Switch fixed contact 54: Voltage detection Circuit 55: Transfer circuit 56: Transfer connector 58: Transfer receiver circuit 60: Non-volatile memory 62: Monitoring control unit 64: Voltage drop alarm unit 66: Log 70: Wireless tag 82: Printed circuit board 84: Smoke detection unit 86: Sponge 88: Screw 90: Smoke detection unit main body 92: Insect net 94: Smoke detection unit cover

Claims (6)

A battery for supplying operating power;
An inspection switch that is operated by the inspection operation unit and confirms a predetermined operation ;
When detecting the operation of the pre-Symbol test switch when detecting the voltage drop of the previous SL cell, a voltage drop alarm unit you output a predetermined voice message,
Equipped with a,
The voltage drop alarm unit is
If the operation of the inspection switch is not detected until a predetermined time has elapsed since detection of the voltage drop, an alarm sound is intermittently output at a predetermined period,
A fire alarm device that outputs the predetermined voice message and stops the intermittent output of the alarm sound for a predetermined time when an operation of the inspection switch is detected during the intermittent output of the alarm sound .
The fire alarm device according to claim 1, wherein the voltage drop alarm unit is:
When a voltage drop of the battery is detected, a predetermined failure display is performed,
When detecting the operation of the test switch in the fault display, fire alarm, wherein the output to Rukoto the predetermined voice message.
The fire alarm device according to claim 2, wherein the voltage drop alarm unit blinks an indicator lamp at a predetermined cycle to display a fault.
In fire alarm according to claim 1, wherein the voltage drop alarm unit, if the operation of the test switch until the lapse of a predetermined period from the detection of the voltage drop is not detected, intermittent output of the alarm sound The fire alarm device is characterized in that the alarm sound is intermittently output after the predetermined period is shortened stepwise .
5. The fire alarm according to claim 4, wherein the voltage drop alarm unit intermittently outputs the alarm sound every time the alarm sound is output a predetermined number of times after the start of output of the alarm sound. A fire alarm characterized by shortening in steps.
In the fire alarm according to claim 1,
Equipped with a monitoring control unit that judges fire from the detection signal of the sensor unit and outputs an alarm,
The voltage drop alarm unit, the case of detecting the voltage drops in the alarm operation by the monitoring control unit, Rutotomoni not locked stop the alarm operation after continued for a predetermined time to perform the alarm operation of the battery voltage reduction A fire alarm characterized by.

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